Fuel Gauge

Posted in Watercraft Parts by admin on October 20, 2010

The fuel gauge quit working on my friends 1986 Dodge slant six truck.What is best way to diagnos?

The fuel gauge quit working on my friends 1986 Dodge slant six truck. A new sending unit will cost about $80. What is the most likely problem. Is there a good way to diagnose? Also if it is the gauge where could we get a replacement. I couldn't find one anywhere. Thanks. -Joseph

9 times out of 10, the sending unit gives out. You can test the sending unit as it is just a float that connects to a rheostat that sends the voltage signal to the gauge. Drop the tank, remove the in-tank assembly, unplug and remove the sending unit. Then, take an ohmmeter to the two leads on the sending unit, manually work the float up and down and watch how the meter responds to the sending unit. There should be a steady rise and fall of ohms displayed on the meter as you move the float. If the display is erratic or non responsive, then the sending unit is bad and you will have to cough up the 80 bucks for a new one if you really want the gauge to work again.

The alternative is to fill up every so many miles, keeping track with your odometer or trip odometer.

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